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Finding the Fourth Proportional to 42.55, 58.70 and 34.79

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Solution

The fourth proportional to 42.55, 58.70 and 34.79 is: 47.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.55 : 58.70 = 34.79 : x
  2. Step 2: Convert to fraction form
    42.55/58.70 = 34.79/x
  3. Step 3: Cross multiply
    42.55x = 58.70 × 34.79
  4. Step 4: Simplify right side
    42.55x = 2,041.71
  5. Step 5: Solve for x
    x = 2,041.71/42.55
  6. Step 6: Final answer
    x = 47.98

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.